/**
 * Created by litao on 2018/8/26.
 */

const util = require('./util');
const webpack = require('webpack');
const config = require('./config');
const merge = require('webpack-merge');
const baseWebpackConfig = require('./webpack.base.conf');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

const webpackConfig = merge(baseWebpackConfig, {
    module: {
        rules: util.styleLoaders({
            sourceMap: config.build.productionSourceMap,
            extract: true,
            usePostCSS: true
        })
    },
    devtool: config.build.productionSourceMap ? config.build.devtool : false,
    output: {
        path: config.build.assetsRoot,
        filename: util.assetsPath('js/[name].[chunkhash].js'),
        chunkFilename: util.assetsPath('js/[id].[chunkhash].js')
    },
    plugins: [
        // http://vuejs.github.io/vue-loader/en/workflow/production.html
        new webpack.DefinePlugin({
            'process.env': require('./config/prod.env.js')
        }),
        new UglifyJsPlugin({
            uglifyOptions: {
                compress: {
                    warnings: false
                }
            },
            sourceMap: config.build.productionSourceMap,
            parallel: true
        }),
        // extract css into its own file
        new ExtractTextPlugin({
            filename: util.assetsPath('css/[name].[contenthash].css'),
            // Setting the following option to `false` will not extract CSS from codesplit chunks.
            // Their CSS will instead be inserted dynamically with style-loader when the codesplit chunk has been loaded by webpack.
            // increasing file size: https://github.com/vuejs-templates/webpack/issues/1110
            allChunks: false,
        }),
        // Compress extracted CSS. We are using this plugin so that possible
        // duplicated CSS from different components can be deduped.
        new OptimizeCSSPlugin({
            cssProcessorOptions: config.build.productionSourceMap
                ? { safe: true, map: { inline: false } }
                : { safe: true }
        }),
        // generate dist index.html with correct asset hash for caching.
        // you can customize output by editing /index.html
        // see https://github.com/ampedandwired/html-webpack-plugin
        new HtmlWebpackPlugin({
            filename: config.build.index,
            template: 'index.html',
            inject: true,
            favicon: util.resolve('favicon.ico'),
            title: 'jboot-front',
            path: config.build.assetsPublicPath + config.build.assetsSubDirectory,
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeAttributeQuotes: true
                // more options:
                // https://github.com/kangax/html-minifier#options-quick-reference
            },
            // necessary to consistently work with multiple chunks via CommonsChunkPlugin
            chunksSortMode: 'dependency'
        }),
        // keep module.id stable when vender modules does not change
        new webpack.HashedModuleIdsPlugin(),
        // enable scope hoisting
        new webpack.optimize.ModuleConcatenationPlugin(),
        // split vendor js into its own file
        new webpack.optimize.CommonsChunkPlugin({
            name: 'vendor',
            minChunks (module) {
                // any required modules inside node_modules are extracted to vendor
                return (
                    module.resource &&
                    /\.js$/.test(module.resource) &&
                    module.resource.indexOf(
                        util.resolve(__dirname, '../node_modules')
                    ) === 0
                )
            }
        }),
        // extract webpack runtime and module manifest to its own file in order to
        // prevent vendor hash from being updated whenever app bundle is updated
        new webpack.optimize.CommonsChunkPlugin({
            name: 'manifest',
            minChunks: Infinity
        }),
        // This instance extracts shared chunks from code splitted chunks and bundles them
        // in a separate chunk, similar to the vendor chunk
        // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
        new webpack.optimize.CommonsChunkPlugin({
            name: 'app',
            async: 'vendor-async',
            children: true,
            minChunks: 3
        }),
        // split echarts into its own file
        new webpack.optimize.CommonsChunkPlugin({
            async: 'echarts',
            minChunks(module) {
                const context = module.context;
                return context && (context.indexOf('echarts') >= 0 || context.indexOf('zrender') >= 0);
            }
        }),
        // split xlsx into its own file
        new webpack.optimize.CommonsChunkPlugin({
            async: 'xlsx',
            minChunks(module) {
                const context = module.context;
                return context && (context.indexOf('xlsx') >= 0);
            }
        }),
        // split codemirror into its own file
        new webpack.optimize.CommonsChunkPlugin({
            async: 'codemirror',
            minChunks(module) {
                const context = module.context;
                return context && (context.indexOf('codemirror') >= 0);
            }
        }),

        // copy custom static assets
        // new CopyWebpackPlugin([
        //     {
        //         from: util.resolve('static'),
        //         to: config.build.assetsSubDirectory,
        //         ignore: ['.*']
        //     }
        // ])
    ]
});

if (config.build.productionGzip) {
    const CompressionWebpackPlugin = require('compression-webpack-plugin');

    webpackConfig.plugins.push(
        new CompressionWebpackPlugin({
            asset: '[path].gz[query]',
            algorithm: 'gzip',
            test: new RegExp(
                '\\.(' +
                config.build.productionGzipExtensions.join('|') +
                ')$'
            ),
            threshold: 10240,
            minRatio: 0.8
        })
    )
}

if (config.build.bundleAnalyzerReport) {
    const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
    webpackConfig.plugins.push(new BundleAnalyzerPlugin());
}

module.exports = webpackConfig;
